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While there are some native plant species that can become invasive, most invasives hail from elsewhere, according to Bernd Blossey, an associate professor in Cornell's Department of Natural Resources.

Blossey said he considers an “invasive” plant species any that can eventually overtake the native ones, becoming the dominant species in an area. In other words, not all non-native plant species are considered invasive, unless they start overtaking the ecosystem.

He also said the best way to protect against invasive plants is to detect them early to prevent them from spreading.
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About Me

I moved to New York City, to the East Village, in 1979. I started city gardening soon thereafter. I moved to Brooklyn in 1992. I now make my home and garden in Flatbush, Brooklyn (USDA Hardiness Zone 7b, AHS Heat Zone 5).